/*
 * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB.  All rights reserved.
 *
 * This file is part of the KD Chart library.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef NULL_PAINT_DEVICE_H
#define NULL_PAINT_DEVICE_H

#include <QPaintDevice>
#include <QPaintEngine>

namespace KChart
{
    class NullPaintEngine : public QPaintEngine
    {
    public:
        virtual bool begin(QPaintDevice * /*pdev*/) { return true; }
        virtual void drawEllipse(const QRectF & /*rect*/) { }
        virtual void drawEllipse(const QRect & /*rect*/) { }
        virtual void drawImage(const QRectF & /*rectangle*/, const QImage & /*image*/, const QRectF & /*sr*/, Qt::ImageConversionFlags /*flags*/) { }
        virtual void drawLines(const QLineF * /*lines*/, int /*lineCount*/) { }
        virtual void drawLines(const QLine * /*lines*/, int /*lineCount*/) { }
        virtual void drawPath(const QPainterPath & /*path*/) { }
        virtual void drawPixmap(const QRectF & /*r*/, const QPixmap & /*pm*/, const QRectF & /*sr*/) { }
        virtual void drawPoints(const QPointF * /*points*/, int /*pointCount*/) { }
        virtual void drawPoints(const QPoint * /*points*/, int /*pointCount*/) { }
        virtual void drawPolygon(const QPointF * /*points*/, int /*pointCount*/, PolygonDrawMode /*mode*/) { }
        virtual void drawPolygon(const QPoint * /*points*/, int /*pointCount*/, PolygonDrawMode /*mode*/) { }
        virtual void drawRects(const QRectF * /*rects*/, int /*rectCount*/) { }
        virtual void drawRects(const QRect * /*rects*/, int /*rectCount*/) { }
        virtual void drawTextItem(const QPointF & /*p*/, const QTextItem & /*textItem*/) { }
        virtual void drawTiledPixmap(const QRectF & /*rect*/, const QPixmap & /*pixmap*/, const QPointF & /*p*/) { }
        virtual bool end()  { return true; }

        virtual Type type() const { return QPaintEngine::User; }
        virtual void updateState(const QPaintEngineState & /*state*/) { }
    };

    class NullPaintDevice : public QPaintDevice
    {
    public:
        NullPaintDevice(const QSize& size) : m_size(size) { }
        ~NullPaintDevice() { }

        int metric(PaintDeviceMetric metric) const
        {
            switch (metric)
            {
            case QPaintDevice::PdmWidth:
                return m_size.width();
            case QPaintDevice::PdmHeight:
                return m_size.height();
            case QPaintDevice::PdmWidthMM:
                return 1;
            case QPaintDevice::PdmHeightMM:
                return 1;
            case QPaintDevice::PdmNumColors:
                return int((uint)(-1));
            case QPaintDevice::PdmDepth:
                return 1;
            case QPaintDevice::PdmDpiX:
                return 1;
            case QPaintDevice::PdmDpiY:
                return 1;
            case QPaintDevice::PdmPhysicalDpiX:
                return 1;
            case QPaintDevice::PdmPhysicalDpiY:
                return 1;
#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
            case QPaintDevice::PdmDevicePixelRatio:
                return 1;
#endif
            }
            return 1;
        }

        QPaintEngine* paintEngine() const
        {
            static NullPaintEngine nullPaintEngine;
            return &nullPaintEngine;
        }

    private:
        QSize m_size;
    };

}

#endif
